Increasing the dimensions of .AVI files without losing the resolution

I wouldn't consider myself new to the world of digital video, but am certainly aware of the ever increasing knowledge base concerning the subject.
I've got an .avi movie that I want to play full screen through my laptop, but due to the current dimensions, the resoution becomes very poor. Is there a way of encoding the .avi into larger dimensions?
Many thanks for any help provided.
Will Kirby
PowerBook G4 12" SuperDrive Mac OS X (10.4.5)

Whether you upsize for playback or increase the encoded size you still are making the program guess as to the pixels surrounding a given point. It never is going to be totally accurate. Just from past experience I find that an upsized display usually looks better than an actual increse in dimensions but that may be just my imagination.

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Increasing the dimensions of .AVI files without losing the resolution

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